What should my tire pressure be?

I have a 2009 ford focus with tires 205/55zr16.
What's the recommended front/rear tire pressure?

There will be a label somewhere on the car with the recommended pressures. It could be around the driver's door opening, or inside the fuel-filler flap, but is more likely around the front left-hand door opening, either on the rear edge of the door, or on the car body just ahead of or behind the door. It will only be visible with the door open.

The 09' Focus has a TPMS system, you can run up to 38 PSI befor you get an overpressure light

It's in your manual and on the sticker affixed somewhere, usually on the driver's door pillar or sometimes in the glovebox. Failing that, a tire place will tell you from their chart, or it's on the chart often posted beside a garage airline.

There shdould be a card screwed to either the post where the driver door latches, or on the driver door itself. And sometimes it says it on the tire.

I do 30 up front and 35 in the rear, that's pretty much close to standard. Anything 30 to 32 is acceptable though.

OMG!
on the side of the tire it says max pressure. Go 2 or 4 psis lower. Just in case you live in a very hot climate. I know, I know, winter is coming I just mention this for future reference.

even if the car has a sensor it has nothing to do with a different tire.
if the car came with a tire that had a max pressure of 35psi from factory and you put 40 it will show a max warning BUT if the tire was replaced with a 44 max pressure tire you will get the same warning BUT you can safely put more air( @40psis) and STILL be under safe limits,

the opposite is NOT true in this situation. IF the car was fitted with a 44 max pressure tire and you replace it with a cheapo tire that has a 35psi max rate guess what? IF you put 38 psi thinking that just because the overinflated warning did not came up you are taking a risk, a very pricey risk. IF the tire IS OVER INFLATED because you add more air that WHAT IS SAYS ON THE SIDE OF THE TIRE that is your problem.
forget the labels on the car OR even the owners manual. READ what it says ON THE TIRE those gizmo P.O.S sensors are calibrated to OEM specific tires(same pressure rating).

IF you replace the tire WITH a tire of the SAME pressure rating then you are ok and the sensor will be on your side doing its job.

all those electronic cr@#p they put on cars are for…#@%… People.
JMO

When you get around to tell us the brand and model of the tires we could tell you.

35 psi.

The answer is not a number but a series of questions.

Door jamb sticker has factory recommendations and sometimes the glovebox has it.
If you have different tires than the sticker, ask your tire guys, discuss your current wear, loading, and how you drive, where, and at what time of year in your climate.
If you carry something often you can add.
if you run empty and it feels or sounds harsh, you can let some out.
But do not ever get below 28psi for passenger car tires because the casing can get hot and start coming apart. It begins by rolling rubber balls up inside and you can't see it.

Open the driver's door and find the placard (sticker) that was put on at the factory to indicate proper tire size and inflation pressure. Use that information to set the pressure in your tires.

I always run my tires at the maximum rated pressure for the tires or as much as 10% less. You can never tell when the few extra psi of air pressure might save your life and a little rougher ride is well worth it.

Further to David's answer, your Ford dealer should write the pressure and tyre size on the back of the user owner handbook before selling the car.

Most tires are about 32-34 if you can't find it on a label inside the drivers door it will also be on the tire itself.

This information is contained within your owner's manual as well as on a sticker placed either on the back of driver's door or on the driver's side B-pillar.

Hi around 30-34 psi in the tyres as it has most of the weight on the front wheels as it is front wheel drive.

I believe that information is on a label on the inside edge of the driver side door. It should have a maximum pressure on the tires as well.

In the US, federal law has required that info to be affixed to the door opening/glove box or underhood for 46 years fing years.

32 to 34 psi.